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<head><meta charset="utf-8"><title>Check if trait bounds always false · t-compiler/help · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/182449-t-compiler/help/index.html">t-compiler/help</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/182449-t-compiler/help/topic/Check.20if.20trait.20bounds.20always.20false.html">Check if trait bounds always false</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/182449-t-compiler/help/topic/Check%20if%20trait%20bounds%20always%20false/near/238911354" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Stu <a href="https://rust-lang.github.io/zulip_archive/stream/182449-t-compiler/help/topic/Check.20if.20trait.20bounds.20always.20false.html#238911354">(May 15 2021 at 17:02)</a>:</h4>
<p>Is there a way to check if the bounds of an <code>impl</code> block are always false?<br>
Specifically, I want to look into <a href="https://github.com/rust-lang/rust/issues/80481">#80481</a> and I'm looking for a way how to even get the information that the trait implementation is always negative.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/182449-t-compiler/help/topic/Check%20if%20trait%20bounds%20always%20false/near/243663314" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Stu <a href="https://rust-lang.github.io/zulip_archive/stream/182449-t-compiler/help/topic/Check.20if.20trait.20bounds.20always.20false.html#243663314">(Jun 23 2021 at 14:51)</a>:</h4>
<p>Just a message to (hopefully) bring back attention to this thread :)</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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